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苏联全苏凿岩技术研究院研究出一种下向电动回转凿岩机。这种凿岩机由一台八个磁极的鼠笼电动机组成,其转速为680转/分,该电动机固定在凿岩机的尾端,并直接与三圆
All Soviet Union Su drilling technology research institute to develop a downward electric rotary rock drill. This rock drill consists of an eight-pole squirrel-cage motor with a rotation speed of 680 rpm, fixed to the end of the rock drill and directly connected to three circles